Euro giants Bayern Munich and Borussia Dortmund have also been monitoring Kadlec this season and are on a list of 15 clubs, including Manchester City and Arsenal, that Czech newspaper Sport say are interested in the 20-year-old forward.
Kadlec has scored five goals in his last three appearances for Sparta who are vying for the Czech title with Victoria Plzen.
His club are expected to set his price-tag at £5million, but agent Pavel Paska has said that the player should remain focused on playing for Sparta for now.
Bayer Leverkusen, Freiburg, Hamburg, Stuttgart, Dynamo Kiev, Red Bull Salzburg, Torino, Sampdoria and Genoa are also mentioned in the Czech press as clubs that have scouted him recently.
Kadlec has hit 10 league goals and four Europa League goals this season, although he failed to score in either leg of Sparta's tie against Chelsea, despite starting both matches.